She said her daughter likes Justin Bieber and thanked him because that's how she knew her daughter "liked boys".
By the way, is this kinda problematic, gays, or is it just me? Her thanking Justin for helping her figure out her daughter is not a lesbian? Is Brandy homophobic? Did straight privilege strike again? Discuss.
I don't think she meant it like that. Young girls are always like "ooh, boyz suck!!!" but eventually they start changing and realizing just the opposite.